C3 WJEC Past Paper January 2013 Q7

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The mark scheme shows a=-2 and b=-4
All you need to do is input the values of x and y at the two points intersecting the axis into the equation for the graph and then solve the two expressions simultaneously.
Much simpler.... and gives the correct answer 😉
Love your videos by the way - been a HUGE help to me.

Drewsilla